US2517358A - Broaching attachment - Google Patents

Description

' Waal/ey 5mm #35H7 WALLACE' SEM/4N By @W and A W SEAMAN BROACHING ATTACHMENT Aug. 1, 1950 Filed Oct. 5o, 1946 Augl, 1950 A. w. sEAMAN 2,517,358

BRoAcHING ATTACHMENT Filed Oct'. 30, 1946 2 Sheets-Sheet 2 Inventor ALBERT WAL LESEMA/ 3 Il "fl and# //f-f Attoneys Patented Aug. 1, 1950 UNITED STATESPATENT OFFICE BRUACHING ATTACHMENT Albert Wallace Seaman, Hutchinson, Kans.

Application October 30, 1946, Serial No. 706,527

10 Claims. (Cl. 90--33) This invention relates to a novel and useful attachment for a drill press, and more specically comprises a broaching and key seating attach ment which may be readily supported by and associated with a conventional type of drill press and may be detachably driven thereby.

The principal objects of this invention are to provide a device which is readily engageable with a conventional type of drill press and which will enable the drill press to perform broaching and key seating operations; wherein a convenient and readily engageable form of driving connection is provided between the attachment and the drill chuck of the drill press; and wherein novel and edicient guiding means are provided for oper'- atively supporting the breaching tool in the device.

These, together with various ancillary objects of the invention which will later become apparent as the following description proceeds, are realized by my invention, one embodiment of which has been illustrated by way of example only in the accompanying drawings, wherein:

Figure 1 is a side elevational view showing the attachment applied to a portion of a drill press; 1

Figure 2 is a top plan view of the attachment.;

Figure 3 is a lower plan view of the attachment;

Figure 4 is a detail in vertical section taken substantially upon the section line 4-4 of Figure 1, and

Figure 5 is a detail View in vertical section being taken substantially upon the section line 5-5 of Figure l.

Referring now more specifically to the annexed drawings, wherein like numerals designate similar parts throughout the several views, numeral Ill designates generally my improved attachment. As shown best in Figure 1, the attachment Ill comprises a right-angularly curved support member l2 having one end thereof terminating in a split clamp indicated at I4 and which is adapted to engage the vertical column it of a conventional type of drill press for detachably supporting the device thereon. The other end of the curved support member I2 is integrally formed with an arm I8 which extends substantially parallel to the clamping means I4, and is of sufficient length to be positioned to underlie the usual drill chuck 2B of the drill press. Journaled in the arm I8 is a crankshaft 22 which is adapted to be engaged detachably in the chuck socket 2D of the drill press and which is provided with a crank cheek 24 adapted to underlie and abut the lower surface of the arm I8, the crankshaft 22 detachably journaling a crank connecting rod 26 which engages a broaching tool in a manner to be later set forth.

Adjacent the arm I8 and extending oppositeiy therefrom is a guide 28 integrally carried by the support member I2, and which, as shown best in Figure 4, is composed of a channel member of cylindrical cross-section and which is longitudinally slotted at its under-surface, as at 30. The outward end of the guide member 28 has a forwardly and downwardly depending lug 32 which is adapted to abut or provide a stop for a piece of work to be operated upon by the broaching or key seating tool. Slidably received within the guide member 28 is a broaching tool 34 of a crosssection conforming and corresponding to the in ternal surface of the guide, and provided at its lower surface and its outer extremity with teeth or the like 36. The rearward surface of the broaching tool 34 is pivoted, as at 38, to the outer end of the connecting rod 2'6.

As shown best in Figure 1, the tool 3A# has a longitudinally extending channel 35 upon its lower side, which channel has an undercut portion 37 at its inner end. A detachable tool blade or bit ill carrying the aforementioned teeth 36 is removably seated in the channel 35, with its rear end seated in the portion 3l for retaining engagement therein, The forward end of the tool 34 has a screw-threaded extension 42 upon which is threaded a nut 44 for securing a retaining cap llt. The latter has a flanged lip embracing the for ward end of the tool blade 40 for securely fastening the latter in the channel 35.

From the foregoing, it is believed that the operation of the device will now be apparent` The support I2 is attached in a depending position from the vertical housing I6 of a conventional drill press, by means of the clamp I4, it being understood that the latter will accommodate the device to various sizes of drill press housings. The crank 22 is now inserted in the arm IB and into the drill press socket 20 and is secured. thereto in a conventional manner. Upon rotation of the drill press chuck 2l), the connecting rod 2S causes reciprocation of the broaching tool. shank 34 in the guide socket 28, whereby the teeth 3S may be specically designed to perform a particular type of work, such as broaching, key seating, sawing, or the like, and that the channel 35 and blade It!) as Well as the guide 28 and tool 34 may be of any desired shape.

In View of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the construction, operation and advantages of the device will be quite apparent te those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though I have herein shown and described a preferred embodiment er" my invention that the same is susceptible to certain changes fully comprehended by the spirit ei the invention as herein described and Within the scope of the appended claims.

I claim as my invention:

1. A breaching attachment for drill presses including a ene-piece support, a clamp for securing said support upon the vertical column of a drill press, a crank jeurnaled in said support and engageable with the drill chuck er a drill press, a guide carried by said support, a breaching tool slidable in said guide and a connecting rod piveted to said crank and te said breaching tool.

2. A breaching attachment for drill presses including a ene-piece support, a clamp for securing said support upon the vertical column of a drill press, a crank jeurnaled in said support and engageable with the drill chuck of a drill press, a guide carried by said support, breaching tool slidable in said guide and a connecting red pivoted to said crank and to said breaching tool, said guide being of circular cross-section and said breaching tool having a body guide portion of circular cross-section slidable longitudinally in said guide.

A. breaching attachment for drill presses including a one-piece support, a clamp ier securing said support upon the vertical column oi a drill press, a crank jeurnaied in said support and engageable with the drill chuck of a drill press, a guide carried by said support, a breaching teel slidable in said guide and a connecting red piveted to said crank and to said breaching tool, said support having an arm extending oppositely te said guide and parallel to said clamp and adapted te underlie the drill chuck ef a drill press, said crank being jeurnaled in said arm and having a cheek bearing upon the under-side of said arm.

Ll. A breaching attachment for drill presses including a one-piece support, a clamp for securing said support upon the vertical column of a drill press, a crank jeurnaled in said support and engageable with the drill chuck of a drill press, a guide carried by said support, a breaching tool slidable in said guide and a connecting rod piyoted to said crank and te said breaching tool, said guide being or circular cross-section and said breaching tool having a body guide portion of circular cross-section slidable longitudinally in said guide, said guide consisting of a channel memn ber having a longitudinal slot along one side thereof.

5. A breaching attachment for drill presses including a ene-piece support, a clamp for secur 4 i ing said support upon the vertical column of a drill press, a crank jeurnaled in said support and engageable with the drill chuck of a drill press, a guide carried by said support, a breaching tool slidable in said guide and a connecting rod pvoted to said crank and to said breaching tool, `said breaching tool having a tool blade receiving channel in its lower surface and a tool blade removably secured in said channel.

6. A breaching attachment for drill presses including a ene-piece support, a clamp for securing said support upon the vertical column of a drill press, a crank journaled in said support and engageable with the drill chuck of a drill press, a guide carried by said support, a breaching tool slidable in said guide and a connecting rod pveted to said crank and te said breaching tool, said breaching tool having a tool blade receiving channel in its lower surface and a tool blade removably secured in said channel, said tool blade having one end secured in an axial recess in an end of said channel and the other end secured by a detachable cap at the other end of said channel.

7. In a drill press having a vertical column, a rotary shaft in the column and a chuck carried by the shaft; a breaching attachment comprising an arcuate support, a clamp carried at one end of said support for securing the latter upon the vertical column, a tubular guide extending from the other end of said support, an arm carried by the other end of said support and extending in an opposite direction to said guide, a bearing at the end of said arm coaxial with said clamp, a crank ,ieurnaled in said bearing and engageable with the chuck, a breaching tool slidable in said guide, and a connecting red pivoted te Said crank and te said breaching tool.

8. 'lhe combination of claim 7 wherein said crank includes a cheek engaging the underside of said bearing.

9. The combination of claim 'Z wherein said guide includes a longitudinal slot along one side thereof and said breaching tool includes teeth extending through said slet.

l0. The combination of claim 9 wherein said guide includes a depending stop at its free end adapted to abut a piece of Work te be operated upon by said breaching tool.

ALBERT WALLACE SEAMAN.

REFERENES CITED The following references are of record in the file of this patent:

UNITED STATES PAIENTS Number Name Date 678,341 Helmberg July 9, 1901 1,366,005 Janssen Jan. 18, 1921 1,367,680 Allen Feb. 8, 1921 1,502,088 Colby July 22, 1924

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